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Title: Ballistic dynamics of flexural thermal movements in a nanomembrane revealed with subatomic resolution
Authors: Liu, Tongjun
Ou, Jun-Yu
Papasimakis, Nikitas
MacDonald, Kevin F.
Gusev, Vitalyi E.
Zheludev, Nikolay I.
Keywords: Science::Physics
Issue Date: 2022
Source: Liu, T., Ou, J., Papasimakis, N., MacDonald, K. F., Gusev, V. E. & Zheludev, N. I. (2022). Ballistic dynamics of flexural thermal movements in a nanomembrane revealed with subatomic resolution. Science Advances, 8(33), eabn8007-.
Project: MOE2016-T3-1-006 
Journal: Science Advances
Abstract: Flexural oscillations of freestanding films, nanomembranes, and nanowires are attracting growing attention for their importance to the fundamental physical and optical properties and device applications of two-dimensional and nanostructured (meta)materials. Here, we report on the observation of short-time scale ballistic motion in the flexural mode of a nanomembrane cantilever, driven by thermal fluctuation of flexural phonons, including measurements of ballistic velocities and displacements performed with subatomic resolution, using a free electron edge-scattering technique. Within intervals <10 μs, the membrane moves ballistically at a constant velocity, typically ~300 μm/s, while Brownian-like dynamics emerge for longer observation periods. Access to the ballistic regime provides verification of the equipartition theorem and Maxwell-Boltzmann statistics for flexural modes and can be used in fast thermometry and mass sensing during atomic absorption/desorption processes on the membrane.
ISSN: 2375-2548
DOI: 10.1126/sciadv.abn8007
Schools: School of Physical and Mathematical Sciences 
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
The Photonics Institute 
Rights: © 2022 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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